% opatch apply
#
# Once applied with opatch, the files are located in $ORACLE_HOME/md/admin
# and $ORACLE_HOME/md/support for patchset_mgdsys_validity.sql
#
# Patch Special Instructions:
# ---------------------------
# To install:
#
# connect to the database using sqlplus / as sysdba
#
# sqlplus> @catmgdidcode
#
# If checking with patchset_mgdapp_validity.sql you find invalid objects
# please run $ORACLE_HOME/rdbms/admin/utlrp.sql which should resolve any issues.
#

Please clarify me on this

1 - I just need to do "opatch apply" in 11.2.0.3 home or I hv to do the install step "sqlplus'/as sysdba' SQL>@11gR2Home/md/admin/catmgdidcode.sql before upgrading Database to 11.2.0.3 ?